As I had the water temp gauge very often in the red zone during my last track events I threw out my old radiator with many bent fins and put in a new custom built competition radiator. Surprise: Water still gets too hot. Turned out now to be the same head gasket problem that Prime member Dangermoney already had some time ago. Read the full story here . Thanks again - without Dangermoney I possibly would have had to search some more months for the cause (as he did in his case).
The weird things with this gasket issue are: Car doesn't overheat during usual street use, you won't detect it with usual compression testing or checking the coolant system, you see nothing unusual in the colour of your oil, you may not even experience any leaks.
The weird things with this gasket issue are: Car doesn't overheat during usual street use, you won't detect it with usual compression testing or checking the coolant system, you see nothing unusual in the colour of your oil, you may not even experience any leaks.